Engineering Materials
Pick up wrong statement about wrought iron

It is very soft and ductile
It contains carbon of the order of 0 to 0.25%
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
It melts at 1535°C

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Engineering Materials
Free carbon in iron makes the metal

Soft and gives a coarse grained crystalline structure
Hard and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure
Soft and gives a fine grained crystalline structure

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Engineering Materials
Cobalt in steel

Improves cutting ability and reduce hardenability
Improves wear resistance, cutting ability and toughness
Gives ductility, toughness, tensile strength and anti corrosion property
Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties

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